IMO the series goes steeply downhill from there until book 11.
The series went downhill? It didn't have a hill to start from.
I ban hammered Jordan after book 2 of WoT. I don't like figuring out the entire conclusion at halfway through and then watch as the author gets lost for 100 pages only to give me that exact conclusion.
On a more positive note, I just finished
Leviathan Wakes (Book 1 of
The Expanse). I will continue reading this series and would recommend in.
It was very different from the TV series, with a much more limited perspective (literally 1st person limited perspective on Holden and Miller). That means that larger system-wide narratives (OPA terrorism, Earth-Martian potshots) are all news information read by those two characters. As a result, it's a lot more personal story.
I understand why the TV series made the choice to include the other perspectives, as it means that they system-wide events could be "shown, not told".
As to the great question, "Is the show better than the book?" It would say they are near equals. Which is saying something, because with the exception of two (
The Princess Bride and
Stardust), I've always found the books to be better than the show.